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301 lines
8.7 KiB
Diff
301 lines
8.7 KiB
Diff
From 3db422fde610960fdca8bd2a2b882015a62860ca Mon Sep 17 00:00:00 2001
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From: Andy Green <andy@openmoko.com>
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Date: Fri, 25 Jul 2008 23:06:20 +0100
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Subject: [PATCH] introduce-BANKCON-meddling-sysfs.patch
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A few questions have been flying around about how optimal
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our waitstates are for various things including Glamo.
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This patch introduces new sysfs nodes
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/sys/devices/platform/neo1973-memconfig.0/BANKCON0
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...
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/sys/devices/platform/neo1973-memconfig.0/BANKCON7
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If you cat them you get translated info about bus speed on
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that chip select, eg,
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# cat /sys/devices/platform/neo1973-memconfig.0/BANKCON1
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BANKCON1 = 0x00000A40
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Type = ROM / SRAM
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PMC = normal (1 data)
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Tacp = 2 clocks
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Tcah = 0 clocks
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Tcoh = 1 clock
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Tacc = 3 clocks
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Tcos = 1 clock
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Tacs = 0 clocks
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You can write them in hex too
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# echo 0x200 > /sys/devices/platform/neo1973-memconfig.0/BANKCON1
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The write format for BANKCON0 - 5 looks like this
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b1..b0 PMC Page Mode Config
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b3..b2 Tacp Page Mode Access Cycle
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b5..b4 Tcah Address hold after CS deasserted
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b7..b6 Tcoh CS hold after OE deasserted
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b10..b8 Tacc Access Cycle Period
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b12..b11 Tcos CS setup before OE asserted
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b14..b13 Tacs Address setup before CS asserted
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BANKCON 6 and 7 have two extra bits
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b16..b15 MT Memory type (00=ROM/SRAM, 11=DRAM)
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If it's ROM/SRAM, the rest of the bits are as described above.
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For DRAM
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b1..b0 SCAN Column address number
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b3..b2 RAS to CAS delay
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The patch is intended to let people experiement on their own. But
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of course you will crash things for sure if the timing is wrong, and
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you can also trash SD Card data if you make Glamo unstable, so remove
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it or remount ro first. Other horrible things are possible, but
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because the settings aren't sticky, you should always be able to
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recover by either normal reboot usually or at worst NOR boot and then
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dfu. Most likely you will just crash your session and have to reboot
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if your settings are bad, but consider yourself warned bad things are
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possible. :-)
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Signed-off-by: Andy Green <andy@openmoko.com>
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---
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arch/arm/mach-s3c2440/mach-gta02.c | 6 +
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arch/arm/plat-s3c24xx/Makefile | 3 +-
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arch/arm/plat-s3c24xx/neo1973_memconfig.c | 186 +++++++++++++++++++++++++++++
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3 files changed, 194 insertions(+), 1 deletions(-)
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create mode 100644 arch/arm/plat-s3c24xx/neo1973_memconfig.c
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diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
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index b3d3797..f30abb6 100644
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--- a/arch/arm/mach-s3c2440/mach-gta02.c
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+++ b/arch/arm/mach-s3c2440/mach-gta02.c
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@@ -412,6 +412,11 @@ struct platform_device gta02_resume_reason_device = {
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.num_resources = 0,
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};
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+struct platform_device gta02_memconfig_device = {
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+ .name = "neo1973-memconfig",
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+ .num_resources = 0,
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+};
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+
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static struct map_desc gta02_iodesc[] __initdata = {
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{
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.virtual = 0xe0000000,
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@@ -829,6 +834,7 @@ static struct platform_device *gta02_devices[] __initdata = {
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>a02_nor_flash,
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&sc32440_fiq_device,
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>a02_version_device,
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+ >a02_memconfig_device,
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>a02_resume_reason_device,
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&s3c24xx_pwm_device,
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diff --git a/arch/arm/plat-s3c24xx/Makefile b/arch/arm/plat-s3c24xx/Makefile
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index f60dc5f..baae831 100644
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--- a/arch/arm/plat-s3c24xx/Makefile
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+++ b/arch/arm/plat-s3c24xx/Makefile
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@@ -35,4 +35,5 @@ obj-$(CONFIG_MACH_NEO1973) += neo1973_version.o \
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neo1973_pm_gps.o \
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neo1973_pm_bt.o \
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neo1973_shadow.o \
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- neo1973_pm_resume_reason.o
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+ neo1973_pm_resume_reason.o \
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+ neo1973_memconfig.o
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diff --git a/arch/arm/plat-s3c24xx/neo1973_memconfig.c b/arch/arm/plat-s3c24xx/neo1973_memconfig.c
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new file mode 100644
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index 0000000..55d85fc
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--- /dev/null
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+++ b/arch/arm/plat-s3c24xx/neo1973_memconfig.c
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@@ -0,0 +1,186 @@
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+/*
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+ * Memory access timing control sysfs for the s3c24xx based device
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+ *
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+ * (C) 2008 by Openmoko Inc.
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+ * Author: Andy Green <andy@openmoko.com>
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+ * All rights reserved.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation
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+ *
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/init.h>
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+#include <linux/kernel.h>
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+#include <linux/platform_device.h>
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+
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+#include <asm/hardware.h>
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+#include <asm/mach-types.h>
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+#include <asm/arch/regs-mem.h>
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+
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+static ssize_t neo1973_memconfig_read(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ int index = attr->attr.name[strlen(attr->attr.name) - 1] - '0';
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+ u32 reg = *((u32 *)(S3C2410_MEMREG(((index + 1) << 2))));
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+ static const char *meaning[][8] = {
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+ {
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+ [0] = "normal (1 data)",
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+ [1] = "4 data",
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+ [2] = "8 data",
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+ [3] = "16 data",
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+ }, {
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+ [0] = "2 clocks",
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+ [1] = "3 clocks",
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+ [2] = "4 clocks",
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+ [3] = "6 clocks",
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+ }, {
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+ [0] = "0 clocks",
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+ [1] = "1 clock",
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+ [2] = "2 clocks",
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+ [3] = "4 clocks",
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+ }, {
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+ [0] = "1 clock",
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+ [1] = "2 clocks",
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+ [2] = "3 clocks",
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+ [3] = "4 clocks",
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+ [4] = "6 clocks",
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+ [5] = "8 clocks",
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+ [6] = "10 clocks",
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+ [7] = "14 clocks",
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+ }, { /* after this, only for CS6 and CS7 */
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+ [0] = "ROM / SRAM",
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+ [1] = "(illegal)",
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+ [2] = "(illegal)",
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+ [3] = "Sync DRAM",
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+ }, {
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+ [0] = "8 Column bits",
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+ [1] = "9 Column bits",
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+ [2] = "10 Column bits",
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+ [3] = "(illegal)",
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+ }, {
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+ [0] = "2 clocks",
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+ [1] = "3 clocks",
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+ [2] = "4 clocks",
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+ [3] = "(illegal)",
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+ }
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+ };
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+
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+ if (index >= 6)
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+ if (((reg >> 15) & 3) == 3) /* DRAM */
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+ return sprintf(buf, "BANKCON%d = 0x%08X\n DRAM:\n"
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+ " Trcd = %s\n SCAN = %s\n", index,
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+ reg, meaning[5][reg & 3],
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+ meaning[1][(reg >> 2) & 3]);
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+
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+ return sprintf(buf, "BANKCON%d = 0x%08X\n Type = %s\n PMC = %s\n"
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+ " Tacp = %s\n Tcah = %s\n Tcoh = %s\n Tacc = %s\n"
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+ " Tcos = %s\n Tacs = %s\n",
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+ index, reg, meaning[4][(reg >> 15) & 3],
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+ meaning[0][reg & 3],
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+ meaning[1][(reg >> 2) & 3],
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+ meaning[2][(reg >> 4) & 3],
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+ meaning[2][(reg >> 6) & 3],
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+ meaning[3][(reg >> 8) & 7],
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+ meaning[2][(reg >> 11) & 3],
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+ meaning[2][(reg >> 13) & 3]);
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+}
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+
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+static ssize_t neo1973_memconfig_write(struct device *dev,
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+ struct device_attribute *attr, const char *buf, size_t count)
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+{
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+ int index = attr->attr.name[strlen(attr->attr.name) - 1] - '0';
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+ unsigned long val = simple_strtoul(buf, NULL, 16);
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+
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+ dev_info(dev, "setting BANKCON%d <- 0x%08X\n", index, (u32)val);
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+
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+ *((u32 *)(S3C2410_MEMREG(((index + 1) << 2)))) = (u32)val;
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+
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+ return count;
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+}
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+
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+
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+static DEVICE_ATTR(BANKCON0, 0644, neo1973_memconfig_read,
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+ neo1973_memconfig_write);
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+static DEVICE_ATTR(BANKCON1, 0644, neo1973_memconfig_read,
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+ neo1973_memconfig_write);
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+static DEVICE_ATTR(BANKCON2, 0644, neo1973_memconfig_read,
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+ neo1973_memconfig_write);
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+static DEVICE_ATTR(BANKCON3, 0644, neo1973_memconfig_read,
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+ neo1973_memconfig_write);
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+static DEVICE_ATTR(BANKCON4, 0644, neo1973_memconfig_read,
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+ neo1973_memconfig_write);
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+static DEVICE_ATTR(BANKCON5, 0644, neo1973_memconfig_read,
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+ neo1973_memconfig_write);
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+static DEVICE_ATTR(BANKCON6, 0644, neo1973_memconfig_read,
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+ neo1973_memconfig_write);
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+static DEVICE_ATTR(BANKCON7, 0644, neo1973_memconfig_read,
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+ neo1973_memconfig_write);
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+
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+static struct attribute *neo1973_memconfig_sysfs_entries[] = {
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+ &dev_attr_BANKCON0.attr,
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+ &dev_attr_BANKCON1.attr,
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+ &dev_attr_BANKCON2.attr,
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+ &dev_attr_BANKCON3.attr,
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+ &dev_attr_BANKCON4.attr,
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+ &dev_attr_BANKCON5.attr,
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+ &dev_attr_BANKCON6.attr,
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+ &dev_attr_BANKCON7.attr,
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+ NULL
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+};
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+
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+static struct attribute_group neo1973_memconfig_attr_group = {
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+ .name = NULL,
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+ .attrs = neo1973_memconfig_sysfs_entries,
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+};
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+
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+static int __init neo1973_memconfig_probe(struct platform_device *pdev)
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+{
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+ dev_info(&pdev->dev, "starting\n");
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+
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+ switch (machine_arch_type) {
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+#ifdef CONFIG_MACH_NEO1973_GTA01
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+ case MACH_TYPE_NEO1973_GTA01:
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+ return -EINVAL;
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+#endif /* CONFIG_MACH_NEO1973_GTA01 */
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+ default:
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+ break;
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+ }
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+
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+ return sysfs_create_group(&pdev->dev.kobj,
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+ &neo1973_memconfig_attr_group);
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+}
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+
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+static int neo1973_memconfig_remove(struct platform_device *pdev)
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+{
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+ sysfs_remove_group(&pdev->dev.kobj, &neo1973_memconfig_attr_group);
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+ return 0;
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+}
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+
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+static struct platform_driver neo1973_memconfig_driver = {
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+ .probe = neo1973_memconfig_probe,
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+ .remove = neo1973_memconfig_remove,
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+ .driver = {
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+ .name = "neo1973-memconfig",
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+ },
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+};
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+
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+static int __devinit neo1973_memconfig_init(void)
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+{
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+ return platform_driver_register(&neo1973_memconfig_driver);
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+}
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+
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+static void neo1973_memconfig_exit(void)
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+{
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+ platform_driver_unregister(&neo1973_memconfig_driver);
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+}
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+
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+module_init(neo1973_memconfig_init);
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+module_exit(neo1973_memconfig_exit);
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+
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+MODULE_LICENSE("GPL");
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+MODULE_AUTHOR("Andy Green <andy@openmoko.com>");
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+MODULE_DESCRIPTION("neo1973 memconfig");
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+
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--
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1.5.6.3
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